Insulator



Nov. 22, 1927.

D. H. OSBORNE INSULATOR Filed Feb. 4, 1924 Patented Nov. 22, 1927.

UNITED STATES PATENT OFF-ICE.

DAVID H. OSBORNE. OF VICTOR, NEXV YORK. Assrenou- 'ro icons rnsunntron con PORATIQN, OF BALTIMORE, MARYLAND, A CORPORATION 01? MARYLAKD.

INsULAron.

Application filed February 4, 1924. Serial No. 690,452.

The invention relates to insulators and more particularly to high tension insulators of the'so-called suspension type, and has for its primary object tov provide means for connecting such insulators in strings comprising a number of interconnected units.

To this end the principal object of my invention, generally considered, is to provlde each insulating unit with means for interlockingly connecting the same to come sponding units'placed either above or below the firstnamed unit; 7

Another object of the invention .isto provide a suspension insulator with means for interlockingly connecting the. same to adjoining units, said means permittingthe rapid connection and disconnection of the unitsandat the same time being so arranged as to positively prevent the unintentional or accidental disengagement of said connected units.

Still another object of the invention is to provide each insulator unit with a metallic cap, said cap having formed therein arecess, the mouth or opening of which being so formed as to only permit the entry or removal of a headed suspension member to or from said recess when the cap and suspension member are disposed at an oblique angle to their normal position.

A still further object of theinvcntion is to improve the construction disclosed and claimed in the copending application of Gil bert P. Ritter and Edwin L. Bradford, Se I rial NO.488,203, filed July 28, 1921, by providing means within the recess of a suspension insulator cap whereby the same is adapted to receive and interlock with a headed suspension member having a comparatively wide range of lateral dimension' To these and other ends, the invention consists of various elements and combinations of elements as hereinafter more fully set forth in the detailed description of the single embodiment of my invention which has been chosen to illustrate the same.

In the drawings:

Figure 1 is a side elevation partially in vertical section, of a suspension insulator unit embodying the invention;

Figure 2 is atop plan View of the cap used with the suspension insulator unit;

Figure 3 is a view partially in plan and partially in section, the section. being taken on. the'line oit Figure 1;

Figure 4 is a fragmentary view, partially in section and partially in side elevation, the section being taken on the line l-4 of Figure 2, loolring'pin the direction of the arrows; and

Figure 5 is a view similar to Figure 4, the

ings like parts are designated by like characters.

The numeral 1 designates generally a sus pension insulator unit having a flaring skirt portion 2-, a neck or stem 3 to which is connected in any suitable manner a 'socketed cap 4;. Extending downwardly from and symmetrically arranged on the'axis of the cap 4 is the suspension member 5 by which the insulator unit may be connected to an adjacent unit or to the conductor as the case -may be. It will be understood of course that when in use a plurality of units is interposed between the conductor and a support, the number of units being dependent upon the voltage carried by the conductorand the distance it is desirable to support the conductor from the support, cross arm or tower. The cap 4 is preferably provided with a trusto-conical portion 6 having a downwardly opening recess into which the stem?) is adapted to fit and be secured. The upper end or" the frusto-conical portion 6 is closed by a wall 7 and ex tendin upwardly therefrom is a conical portion 8 which is recessed, as at 9, to receive a circular head 10 of the suspension member 5 ot the adjacent insulator section. The recess 9 is provided with a mouth or opening 11 formed by a plurality of radial slots'l2 and 13 which intersect substantially adjacent the vertical axis of said cap. The radial slots 12 are in substantial alinement and the slot 13 intersects the same at right angles thereto, By this construction the slots which form the mouth of the recess are numerous advantages requires a nicety of fit between the head 10 and the opening 11 and also requires that the d1stance between the inner faces of the slots 12 and 13 and the upper face of the wall 7 be proportioned to the depth of the head 10. Permissive variations in commercial manufacture of the cap and head would sometimes be sufiicient to allow lateral angling of the cap on the head 10 to such an extent that the head would jam between the corner formed by the intersection of the slots 12 and 13 and the bottom of the recess, which jamming would place the string of insulators out of alinement and reduce the arc-over distance between the conductor and the support. On the other hand, if the cap were of standard size and the head 10 oversize it would be impossible to assemble the insulators. The object of the present invention is to overcome these defects and provide an interlocking ball and socket connection which will allow for the usual variations in the sizes of the parts which occur in commercial manufacture without detriment to the efliciency and serviceability of the connections. I

To maintain the head, when it is connected with the cap, in axial alinement and at the same time allow for comparatively wide variations in the lateral dimension of the head 10, there is provided, substantially tangent to the closed end of the slot 13 and interiorly of the recess, an upright wall or shoulder 14:. When the parts are interconnected the periphery of the head 10 is substantially in engagement with the shoulder 14 and the periphery of the stem 5 spaced but a short distance from the common wall of the slots 12. By this arrangement lateral movement in the direction of length of the slot 13 is avoided and all possibility of accidental movement of the head 10 into a position which would permit the escape thereof from the recess is obviated. Not only is lateral movement of the head 10 prevented by this arrangement, but variations in lateral dimension of the head throu h a comparatively wide range will not ailect the interlocking of the parts.

To prevent excessive angling of the insulator in the direction of the slots 12, I provide projections 15 on the upper face of the wall 7. These projections are so positioned and arranged that they do not interfere with the entry and removal of the head 10 when the parts are placed at an oblique angle to their normal position, as fully described in the co ending Ritter and Bradford application a ove referred to, and are so arranged as to underlie portions of the head 10 when the same is in interlocked position and there by prevent relative vertical movements between the head and cap, and hence obviate any excessive angling between the head and cap in the direction of length of the slots 12. The parts 15 therefore will prevent all possibility of the head 10 jamming between the projections formed by the intersection of either slot 12 with the slot 13, and all possibility of the insulators being supported I claim and desire to secure by Letters Patent, is:

1. In a high tension insulator of the suspension type, a body of insulating material, a metallic cap thereon, the cap having a recess therein with a closed bottom, the top of the cap being formed with opposite radial slots and a lateral radial slot intersecting the first named slots at the center thereof, a suspension element formed as a bolt having a. disk-like head adapted to be inserted through the first named slots when in tilted position whereby the bolt may be arranged to extend at the axis of the body, the recess having a substantially vertical wall at the outer end of the second named slot, said wall being engageable bythe edge of the disk to limit lateral movement thereof in one direction.

2. In a high tension insulator of the suspension type, a body of insulating material, a metallic cap thereon, the cap having a recess therein with a closed bottom, the top of the cap being formed with opposite radial slots and a lateral radial slot intersecting the first named slots at the center thereof, a suspension element formed as a bolt having a disk-like head adapted to be inserted through the first named slots when in tilted position whereby the bolt may be arranged to extend at the axis of the body, the recess having a substantially vertical wall at the outer end of the second named slot, said wall beingengageable by the edge of the disk to limitlateral movement thereof in one direction, and means formed integrally with the cap atthe bottom of the recess and located at opposite sides of the longitudinal axis and at opposite sides of the center line of the second. named slot.

3. In a high tension insulator of the suspension type, a body of insulating material, a metallic cap thereon, the cap having a re- .cess therein with a closed bottom, the top of the cap being formed with opposite radial slots and a lateral radial slot intersecting the first named slots at the oenterthereof, a suspension element formed as a bolt having a grally upon the bottom of the recess at disk-like head adapted to be inserted through points oppositethe center line of the second the first named slots when in tilted position named slot and extending beneath the disk whereby the bolt may be arranged to extend for limiting angular tilting thereof in a di- 8 at the axis of the body, the recess having a rection at an angle with respect to the angle 15 substantially vertical wall at the outer end of tilt necessary to effect passage of the disk of the second named slot, said Wall being enthrough the first namedslots. vgagealole by the edge of the disk to limit In testimony whereof I affix my signature. lateral movement thereof in one direction, 10 and upstanding projections formed inte- DAVID E. OSBORNE. 

